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gi6                           'Appendix II.

Rider Engine, Fig. 879, which has been much used for small
powers, c is a displacer, and D the power plunger, their cranks
being about 90 apart. At F is a fire (hot body), at E a water
jacket (refrigerator), and H is the regenerator; the cycle being
essentially that of Stirling, and the operations as follows :

1.  Air compressed in D takes heat and expands: thus work

is done by the gas.

2.  The air is transferred to  c  nearly at  constant  volume,

giving heat to H.

3.  Air under c is compressed, losing heat to E : thus work is-

done on the gas.

4.  The air is re-transferred to D at nearly constant volume,.

taking heat from H.